tommis85

You wouldn't happen to have posted a dyno graph in that turbo/dyno results thread? Really keen to see some of these....have been looking at GT-SS plots as thet're very similar turbos.

Well, I've observed the bov's doing this myself...not exactly sure how much they influence shuffle down low...they do open down low so they would take some of the air away from the turbos (sucking it back thru the recirc pipe and stealing it before it its the compressor....but after running thru afm offcourse) The reason why the stock intake piping reduces shuffle is because it generates so much drag inside it's piping (corrugations in the rubber piping, afm mesh etc etc) that it effectively throttles the turbos by just enough to stop them getting too far ahead of themselves which would cause shuffle (too much air for engine to ingest etc)

Yeh I read on some other forums that it's the removal of the stock bov's and putting in a hard piping kit that does it. The BOV's do some interesting stuff....they actually open to almost half way when you blip the throttle to get some air into the engine quicker by bypassing the turbos. All this gear apparently also stops or minimises shuffle. But I will know for sure soon as I'll be putting my -9's on with FULL factory intake and compressor to cooler plumbing.

Hey just read your sig - I didn't know you have -9's 400 horsies at 18 pounds is quite a nice figure.

Nice work! Yeh I ordered my -9's a couple days ago so might be fitting them on the weekend. So what sort of plumbing are you running - you got all your stock stuff still on there including factory BOV's?

LOL I just asked that on FB Yeh I'd be up for a look hey

Yeh I read that the stock intake pipework along with the AFM's etc creates enough drag to slow down the turbos down low thus reducing the shuffle affect. If you totally streamline the intake side and the exhaust side you give those buggers free reign down low - spin up way too fast! I think it's the sharp bends and the corrugations in the rubber intake pipes that do the trick....drag and turbulence galore lol

Wow that sounded pretty nasty what you had there! Well I'll be taking it down to one of the tuners at the coast like Mercury or Godzilla for a decent tune - the people round where I live have no idea on tuning imports, let alone 26's.

Yeh it would be like an most epic flutter of all time

Yeh i reckon that could be quite annoying and other peeps would ask you every time what's wrong with your car lol! I've never had it but I'm assuming it doesn't do much harm to anything...although I think someone on here said that it did make their car shudder a bit?

So this is happening tomorrow? I take it you just rock up with helmet etc...and you don't need the aasa for it?

Haha yeh I hit the wrong quote button Yeh that's a bit cheaper than 1

Everything's sold peoples!

Just out of interest - found a video with some very intense shuffling...R33 on dynopack....skip to about 40 seconds into video..

Hey sounds good...how much does it cost? I'm keen to let loose lol at my quoting fail

Hey sounds good...how much does it cost? I'm keen to let loose

I'll prob's head down when my own car needs the tuning hey

I would think that more power = more power down low too = more fumes down low = even more turbo spool down there....so it would be either in proportion or even more shuffle?

Easy now peoples...I was just asking about shuffle at the stage....surge as we know is a lot more violent and the turbos I was looking at are too small and inefficient to cause this. Well I think they would be anyway ...except for a maybe a set of hybrid 2530's that I was looking at with enlarged compressor wheels

I like. However, my goal is to just break the 400hp mark That there is like 680hp or something!!! Lots of -7 kits floating around..... -9's very rare, probably because people either don't buy them because they're more expensive than the other GT2860's or...because people don't sell them because they like them lol

So another vote for that the tune would have a lot to do with it? I'm guessing that tune wise, it's all about trying to get the engine to swallow as much air as posible down low to stay ahead of shuffle causing density. As soon as the engine can't use the air, that air has to leave somewhere else and that usually through a stalled out turbo. Well, when I bolt these on I want to take her down to Godzilla or the likes to get that tune.

That's all very true, just curious why in this particular thread you're the only one experiencing these problems? The majority seem to say that there're no issues with the smaller turbos in the GT2860 range.

Ah damn iPhone! ....was say that it will instead go back down the othe turbos compressor out let thus causing it to momentarily stall out. It's meant to happen with bigger, efficient bb turbos where the two turbs create too much boost down low...similar to surge. It's meant to give off a shoo shoo shoo sound when it happens...hope that helps

As far as I know, shuffling is a thing where the two turbos will try to stall each other out down in low rpm ranges because they're creating too much air than what the engine can swallow. Both turbos are trying to force more air into the one overhead collecting pipe and that pressure will not always go to the intake mani but back down the other turbos xompress

I just meant in general Nismoid Yeh this thread looks promising and I reckon all will be sweet.